单项选择题


A．She knows.
B．She has a dictionary.
C．She is not sure.
D．She has seen it.
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单项选择题
Why did Virgil Spears waist to be put in prison
A．Mr. Spears enjoyed living in prison.
B．Mr. Spears was known as a greedy man in his community.
C．The police in New York were not very efficient.
D．The only way for Mr. Spears to support his family was to go to prison again.
单项选择题
For detecting colors, we depend, primarily on ______.
A．interpretation by the brain.
B．cones of the retina.
C．rods of the retina.
D．optic nerve.
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